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I think the reason that drones have become so controversial is because they're used in Pakistan; they're used in Yemen; they've been used in all kinds of places.

Getting permission to use a drone in Egypt was problematical.

Drones overall will be more impactful than I think people recognize, in positive ways to help society.

Our enemies are real. But so are the moral questions and long-term political implications of drone strikes.

Drones can be a highly effective way of dealing with high-priority targets, but they should not become the drug of choice for an administration that is afraid to use successful, legal and safe tactics of the past.

It is already clear that, because of advances in technology, drones are going to play an increased role in warfare in the years ahead. It is therefore vital that the legal frameworks governing their use are robust and internationally recognised.

Drones can be useful tools, and I am all about useful tools. One of my mottos is 'the right tool for the right job.'

A drone isn't any different than a bomb; it's not any different than other weapons that are used, where there is always a capacity for people to be killed who you wished were not. It's just the weapons platform.

You need to put drones under control; you need to lay out certain rules of engagement in order to prevent or minimize collateral casualties. It is extremely important.